我有一个 SQL 语句,其中包含嵌入在ARRAY()
像这样:
SELECT foo, ARRAY(SELECT x from y) AS bar ...
查询工作正常,但是在 psycopg2 结果游标中,数组作为字符串返回(如"{1,2,3}"
),而不是列表。
我的问题是,将此类字符串转换为 python 列表的最佳方法是什么?
它对我有用,无需解析:
import psycopg2
query = """
select array(select * from (values (1), (2)) s);
"""
conn = psycopg2.connect('dbname=cpn user=cpn')
cursor = conn.cursor()
cursor.execute(query)
rs = cursor.fetchall()
for l in rs:
print l[0]
cursor.close()
conn.close()
执行结果:
$ python stackoverflow_select_array.py
[1, 2]
Update
您需要注册 uuid 类型:
import psycopg2, psycopg2.extras
query = """
select array(
select *
from (values
('A0EEBC99-9C0B-4EF8-BB6D-6BB9BD380A11'::uuid),
('A0EEBC99-9C0B-4EF8-BB6D-6BB9BD380A11'::uuid)
)s
);
"""
psycopg2.extras.register_uuid()
conn = psycopg2.connect('dbname=cpn user=cpn')
cursor = conn.cursor()
cursor.execute(query)
rs = cursor.fetchall()
for l in rs:
print l[0]
cursor.close()
conn.close()
Result:
$ python stackoverflow_select_array.py
[UUID('a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11'), UUID('a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11')]
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